Edge density(vector data)

This function allows you to calculate the edge density of class i in a categorical landscape in vector data format

Usage

vm_c_ed(landscape, class_col, count_boundary = TRUE)

Arguments

landscape

the input landscape image,

class_col

the name of the class column of the input landscape

count_boundary

Include landscape boundary in edge length (default: TRUE)

Value

the returned calculated length is in column "value", and this function returns also some important information such as level, class number and metric name. Moreover, the "id" column, although it is just NA here at class level. we need it because the output struture of metrics at class level should correspond to patch level one by one, and then it is more convinient to combine metric values at different levels and compare them.

Details

Edge density is calculated as the total edge length divided by total landscape area (in m/ha).

Note: The default differs from landscapemetrics (default: FALSE) because vector polygon boundaries are explicit geometric features. Set count_boundary=FALSE for direct comparison with landscapemetrics results.

Examples

vm_c_ed(vector_landscape, "class")
#> # A tibble: 3 × 5
#>   level class id    metric value
#>   <chr> <chr> <chr> <chr>  <dbl>
#> 1 class 1     NA    ed     2467.
#> 2 class 2     NA    ed     3244.
#> 3 class 3     NA    ed     4000 
vm_c_ed(vector_landscape, "class", count_boundary = FALSE)
#> # A tibble: 3 × 5
#>   level class id    metric value
#>   <chr> <chr> <chr> <chr>  <dbl>
#> 1 class 1     NA    ed     2111.
#> 2 class 2     NA    ed     3056.
#> 3 class 3     NA    ed     3211.